Do you go to school Saturday morning? A. in B. atC. onD. for

问题补充：

Do you go to school Saturday morning?

A. in

B. at

C. on

D. for

答案：

A. in

B. at

(答案→)C. on

D. for

解析：考察介词。At表示在具体时刻，for后接一段时间，in表示在一个时间范围，on表示在具体某一天。根据下文Saturday morning可知选C.